ASTM E2501-11(2022)

Standard Specification for Light Source Products for Inspection of Fluorescent Coatings

ABSTRACT
This specification provides the requirements for light source products intended for excitation of fluorescent materials used as a system for detection of defects in industrial coatings. This includes the examination of both longer wavelength fluorescing primer coatings as well as non-fluorescent top coatings. Also, this specification establishes the radiometric requirements of the light source product in terms of required wavelength range and minimum irradiance. Safety requirements shall be established for the light source product necessary to ensure the product will not pose a threat to visual health. Irradiance test method shall be performed to conform to the specified requirements, in accordance to the test method.
SIGNIFICANCE AND USE
4.1 Light source products conforming to this specification are intended to be used in conjunction with coatings specially formulated with fluorescent colorants as a system for the visual detection of defects in industrial protective coatings.  
4.2 Visible fluorescence from the coating enhances the contrast of coating irregularities and defects and is produced by excitation of visible-activated fluorescent colorants in the coating.  
4.3 Light source products with defined wavelength and intensity properties are required to produce adequate visible fluorescence for easy visual location of defects.  
4.4 A light source product is considered to consist of a light source component incorporated into an optical, electrical, mechanical, and power supply system that makes it suitable for use in an industrial environment. The entire light source product is subject to this standard. The light source component and any subassemblies of the light source product are not subject to this standard.  
4.5 This specification is limited to light source products providing excitation in the range from 400 nm to 420 nm.
SCOPE
1.1 This specification provides the requirements for light source products intended for excitation of fluorescent materials used as a system for detection of defects in industrial coatings. This includes the examination of both longer wavelength fluorescing primer coatings as well as non-fluorescent top coatings.  
1.2 This specification establishes the radiometric requirements of the light source product in terms of required wavelength range and minimum irradiance.  
1.3 This specification establishes safety requirements for the light source product necessary to ensure the product will not pose a threat to visual health.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2022
• ICS: 25.220.01 - Surface treatment and coating in general
• ICS: 29.140.40 - Luminaires
• Technical Committee: E12 - Color and Appearance
• Drafting Committee: E12.05 - Fluorescence

Relations

• Refers: ASTM G138-12(2020)e1 - Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance
• Effective Date: 01-Jun-2020
• Refers: ASTM E284-13b - Standard Terminology of Appearance
• Effective Date: 01-Nov-2013
• Refers: ASTM E284-13a - Standard Terminology of Appearance
• Effective Date: 01-Jun-2013
• Refers: ASTM E284-13 - Standard Terminology of Appearance
• Effective Date: 01-Jan-2013
• Refers: ASTM E284-12 - Standard Terminology of Appearance
• Effective Date: 01-Jul-2012
• Refers: ASTM G138-12 - Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance
• Effective Date: 01-Jun-2012
• Refers: ASTM E1341-06(2011)e1 - Standard Practice for Obtaining Spectroradiometric Data from Radiant Sources for Colorimetry
• Effective Date: 01-Nov-2011
• Refers: ASTM E284-09a - Standard Terminology of Appearance
• Effective Date: 01-Jun-2009
• Refers: ASTM E284-09 - Standard Terminology of Appearance
• Effective Date: 01-Jan-2009
• Refers: ASTM E284-08 - Standard Terminology of Appearance
• Effective Date: 01-Aug-2008
• Refers: ASTM E284-07 - Standard Terminology of Appearance
• Effective Date: 15-Jul-2007
• Refers: ASTM E284-06b - Standard Terminology of Appearance
• Effective Date: 01-Dec-2006
• Refers: ASTM E284-06a - Standard Terminology of Appearance
• Effective Date: 15-Jul-2006
• Refers: ASTM E1341-06 - Standard Practice for Obtaining Spectroradiometric Data from Radiant Sources for Colorimetry
• Effective Date: 01-Jul-2006
• Refers: ASTM G138-06 - Standard Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance
• Effective Date: 01-Jun-2006

Overview

ASTM E2501-11(2022), Standard Specification for Light Source Products for Inspection of Fluorescent Coatings, establishes critical requirements for light sources used in the inspection of industrial coatings incorporating fluorescent materials. Developed by ASTM International, this standard ensures that these light source products are suitable for the excitation of fluorescent coatings, facilitating the detection of surface defects and irregularities in protective coatings used across various industries. It specifies essential parameters related to radiometric performance, safety, and proper testing to guarantee effective and safe use in industrial environments.

Key Topics

• Scope and Purpose
  This standard applies to light source products specifically designed to excite fluorescent colorants in coatings, enabling more effective visual inspection by enhancing defect contrast.

• Radiometric Requirements

  • Light sources must provide excitation in the wavelength range of 400 nm to 420 nm.
  • A minimum irradiance must be met to ensure adequate fluorescence for defect detection.
  • Ninety-five percent of light output should be within the specified wavelength range, ensuring efficacy and reliability.

• Safety Provisions

  • Light source products must comply with recognized visual health safety standards, such as IEC 62471 and ANSI/IESNA RP27.3, to prevent hazards associated with intense visible and near-UV emissions.
  • Recommendations for visual ergonomic eyewear are included to minimize inspector discomfort without sacrificing defect visibility.

• Testing and Certification

  • Detailed procedures for irradiance measurement using calibrated equipment are mandated.
  • Certification requirements ensure that products are tested and documented as compliant when specified by contract.

Applications

This specification is crucial for industries that demand high-reliability coating inspection, including:

• Industrial and Protective Coatings
  Used in manufacturing, construction, and maintenance environments where protective coatings are applied to metals, concrete, or composites, particularly for corrosion resistance or aesthetic requirements.

• Quality Control and Assurance
  Facilitates early detection of coating defects such as pinholes, thin spots, or irregular surface coverage, helping reduce rework and costly failures.

• Aerospace, Automotive, and Marine Sectors
  Essential for ensuring critical coatings meet performance and safety standards by visually enhancing the detection of imperfections during manufacturing or maintenance inspections.

• Environmental and Occupational Health
  Enhances inspector safety by establishing clear visual health criteria for equipment and recommended use of appropriate eyewear.

Related Standards

ASTM E2501-11(2022) is referenced in coordination with other key standards, enhancing its value in a comprehensive quality assurance system:

• ASTM E284 – Terminology of Appearance
  Provides definitions for relevant terms used in visual appearance inspection.

• ASTM E1341 – Practice for Obtaining Spectroradiometric Data from Radiant Sources for Colorimetry
  Outlines testing protocols for evaluating light source spectral characteristics.

• ASTM G138 – Test Method for Calibration of a Spectroradiometer Using a Standard Source of Irradiance
  Specifies calibration requirements for accurate irradiance measurements.

• IEC 62471 – Photobiological Safety of Lamps and Lamp Systems
  Sets international guidelines for evaluating lamp safety and their influence on visual health.

• ANSI/IESNA RP27.3 – Photobiological Safety for Lamps and Lamp Systems
  Provides general requirements for lamp safety in various applications.

• ANSI/ISEA Z87.1 – Occupational and Educational Personal Eye and Face Protection Devices
  Establishes criteria for protective eyewear, including transmittance specifications relevant to fluorescent inspection environments.

Summary

Adhering to ASTM E2501-11(2022) enables industries to standardize and optimize the inspection of fluorescent coatings, thus improving product quality, workplace safety, and regulatory compliance. This specification is an indispensable resource for professionals involved in coating manufacturing, application, and inspection processes, ensuring consistency and safety in the visual detection of coating defects. For more information or to obtain certified measurement and testing equipment, refer to ASTM International and related organizations.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E2501 −11 (Reapproved 2022)
Standard Specification for
Light Source Products for Inspection of Fluorescent
Coatings
This standard is issued under the fixed designation E2501; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E1341 Practice for Obtaining Spectroradiometric Data from
Radiant Sources for Colorimetry
1.1 This specification provides the requirements for light
G138 Test Method for Calibration of a Spectroradiometer
source products intended for excitation of fluorescent materials
Using a Standard Source of Irradiance
used as a system for detection of defects in industrial coatings.
2.2 IEC Standards:
This includes the examination of both longer wavelength
IEC 62471-2:2006 Edition 1—Photobiological Safety of
fluorescing primer coatings as well as non-fluorescent top
Lamps and Lamp Systems
coatings.
2.3 ANSI Standards:
1.2 This specification establishes the radiometric require-
ANSI/IESNA RP27.3-2005 Photobiological Safety for
ments of the light source product in terms of required wave-
Lamps and Lamp Systems — General Requirements
length range and minimum irradiance.
ANSI/ISEA Z87.1 Occupational and Educational Personal
1.3 Thisspecificationestablishessafetyrequirementsforthe
Eye and Face Protection Devices
light source product necessary to ensure the product will not
pose a threat to visual health.
3. Terminology
1.4 The values stated in SI units are to be regarded as
3.1 Definitions—The definitions of terms in Terminology
standard. No other units of measurement are included in this
E284 are applicable to this standard.
standard.
4. Significance and Use
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.1 Light source products conforming to this specification
responsibility of the user of this standard to establish appro- are intended to be used in conjunction with coatings specially
priate safety, health, and environmental practices and deter-
formulated with fluorescent colorants as a system for the visual
mine the applicability of regulatory limitations prior to use.
detection of defects in industrial protective coatings.
1.6 This international standard was developed in accor-
4.2 Visible fluorescence from the coating enhances the
dance with internationally recognized principles on standard-
contrastofcoatingirregularitiesanddefectsandisproducedby
ization established in the Decision on Principles for the
excitation of visible-activated fluorescent colorants in the
Development of International Standards, Guides and Recom-
coating.
mendations issued by the World Trade Organization Technical
4.3 Light source products with defined wavelength and
Barriers to Trade (TBT) Committee.
intensity properties are required to produce adequate visible
fluorescence for easy visual location of defects.
2. Referenced Documents
4.4 Alight source product is considered to consist of a light
2.1 ASTM Standards:
source component incorporated into an optical, electrical,
E284 Terminology of Appearance
mechanical,andpowersupplysystemthatmakesitsuitablefor
use in an industrial environment. The entire light source
product is subject to this standard. The light source component
This specification is under the jurisdiction of ASTM Committee E12 on Color
and Appearance and is the direct responsibility of Subcommittee E12.05 on
and any subassemblies of the light source product are not
Fluorescence.
subject to this standard.
Current edition approved Oct. 1, 2022. Published November 2022. Originally
approved in 2006. Last previous edition approved in 2017 as E2501 – 11 (2017).
DOI: 10.1520/E2501-11R22.
2 3
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